Michael McCandless created LUCENE-6094:
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Summary: IW.rollback can take forever when CMS has stalled threads
Key: LUCENE-6094
URL: https://issues.apache.org/jira/browse/LUCENE-6094
Project: Lucene - Core
Issue Type: Bug
Components: core/index
Reporter: Michael McCandless
Assignee: Michael McCandless
Priority: Minor
Fix For: 5.0, Trunk
CMS hard-stalls incoming threads for denial-of-service protection when merging
cannot keep up with whatever is producing new segments.
When you call IW.rollback, it asks all merges to abort, and a running merge
will periodically check to see if it should abort.
However, a stalled merge fails to check, which means rollback can take
indefinitely long; I've seen this in Elasticsearch causing shutdown to take >
10 sec.
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